Interferon-alpha (IFN-alpha) Fused Protein Having IFN-alpha and Cytoplasmic Transduction Peptide (CTP)
a technology of interferon and alpha, which is applied in the field of interferon (ifn) fused protein having ifn fused to a cytoplasmic transduction peptide (ctp), to achieve the effects of improving penetration and settlement ability, and improving translocation and settlemen
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example 1
Synthesis of Template of Human Interferon-α (IFN-α) Gene for High-Level Expression in E. coli
[0087]Since the Interferon-α (IFN-α) gene originating from human contains a considerable amount of codons that are not expressed well in E. coli, it is known that the degree of expression of IFN protein is very low in the absence of modification. In particular, such codon clusters as AGG / AGA, CUA, AUA, CCA or CCC are reported to degrade both quantity and quality of the proteins expressed in E. coli (2-3).
[0088]Among them, the AGG codon cluster has the worst effect, presumably because the available tRNA pool is limited and the cluster binds competitively with ribosomes due to similarity to the Shine-Dalgarno sequence (4-5).
[0089]Thus, in order to improve the degree of expression, the inventors chemically synthesized the full sequence of the human IFN-α gene excluding the rare codon, in consideration of the codon usage frequency of E. coli. First, in order to obtain the human IFN-α2b gene opt...
example 2
Synthesis of IFN or CTP-fused IFN gene by PCR
[0090]In order to obtain DNA of IFN or IFN with the CTP peptide fused at the N- or C-terminal, SOEing PCR was carried out using the primers shown in Table 2 and using the human IFN genes described in Table 1 as template (6):
TABLE 2SEQPrimerIDnamePrimer sequenceNOCFN-15′- 7TATGGTCGTCGTGCACGTCGTCGTCGTCGTCGTTGCGATCTGCCGCAGACC-3′CFN-25′- 8TAATCTAGAAAAAACCAAGGAGGTAATAACATATGTATGGTCGTCGTGCACGT-3′CFN-35′- 9CAAGGATCCCTCGAGCTATTATTCTTTGCTACGCAGGCT-3′CFN-45′-10GCCTCTAGAAAAAACCAAGGAGGTAATAACATATGTGCGATCTGCCGCAG-3′CFN-55′-11ACGACGACGACGTGCACGACGACCATATTCTTTGCTACGCAGGCT-3′CFN-65′-12TAAGGATCCCTCGAGCTATTAACGACGACGACGACGACGTGCACG-3′
example 2-1
Synthesis of IFN-α Gene (sIFN) Modified for High-Level expression of IFN Protein
[0091]The gene originating from human has the problem in that the level of expression is very low in E. coli in the absence of modification. To solve this problem, the inventors carried out two-step reactions to obtain synthetic gene in consideration of the codon usage of E. coli. First, they mixed the 6 oligomers shown in Table 1, with the same quantity, and allowed them to react at 60° C. for 30 minutes after adding pfu DNA polymerase and dNTP mixture. As a result, a template of human IFN-α gene was synthesized according to the codon usage. Then, PCR was carried out using the template and using the CFN-4 and CFN-3 primers. As a result, the human IFN-α gene was obtained as shown in FIG. 1 (SEQ ID NO: 27). The obtained ˜0.55 kb PCR product is shown as lane 3 in FIG. 4.
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